Panel filter construction



FIG. 1 is a perspective view of a panel filter construction;

FIG. 2 is an enlarged right side view of FIG. 1, the left side being identical thereto;

FIG. 3 is an enlarged top plan view of FIG. 1;

FIG. 4 is an enlarged bottom plan view of FIG. 1;

FIG. 5 is an enlarged front side view of FIG. 1, the back side view being identical thereto;

FIG. 6 is a perspective view of a second embodiment of a panel filter construction; separate layers of filter media in the construction being indicated to contrast in appearance;

FIG. 7 is an enlarged right side view of FIG. 6, the left side being identical thereto;

FIG. 8 is an enlarged top plan view of FIG. 6;

FIG. 9 is an enlarged bottom plan view of FIG. 6;

FIG. 10 is an enlarged front side view of FIG. 6, the back side view being identical thereto;

FIG. 11 is a perspective view of another embodiment of a panel filter construction; an outermost layer of media being lined to indicate blue color, and a next inner layer being marked to indicate color contrast;

FIG. 12 is an enlarged right side view of FIG. 11, the left side being identical thereto;

FIG. 13 is an enlarged top plan view of FIG. 11;

FIG. 14 is an enlarged bottom plan view of FIG. 11; and,

FIG. 15 is an enlarged front side view of FIG. 11, the back side view being identical thereto. 

The ornamental design for a panel filter construction, as shown and described. 